When to plant cucumbers in Quimper: 15 June – 24 September

In Quimper, cucumber: sow for seedlings from 27 April to 27 August; plant into a greenhouse from 25 May to 24 September; plant out into open ground from 15 June to 24 September. For plants and seeds, the places nearby include La Grande Pépinière (garden centre, 2 km) and Legumaj Kergwenn (farm supply, 9 km); addresses and opening hours are below.

Cucumber in Quimper: soil, season and weather

In Quimper the soil, not frost, sets the date: the last frost is over around 8 March, but the top 7 cm of soil reaches 18 °C — the minimum on the cucumber card — only around 15 June, 99 days later.

Last spring frost	8 March
Top 7 cm of soil at 18 °C	15 June, 99 days after the last frost
Into an unheated greenhouse	25 May – 24 September; May outside: 9.6 °C at night, 17.8 °C by day; card 18–25 °C
First autumn frost	9 December, 177 days after the start
Days in the bed to the first harvest (card)	34
First harvest, if planted in this window	19 July – 28 October
Days left for picking	143
Daylight	15:17 on 18 May, 16:01 on 15 June
Watering outdoors when fruiting (card)	every 2 days; the driest month, August, has 11 rainy days

The same dates in Quimper hold for Bell Pepper, Eggplant, Zucchini, Pumpkin and Watermelon.

Cucumber in Quimper: care after planting

Planted on 15 June: in the first weeks water every 4 days.

Feeding, by the card’s schedule from that day:

22 June — feed: nitrogen

Pests and diseases of cucumber to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Quimper during the cucumber season

No month of the season averages above the cucumber card's 18–35 °C by day; the warmest, July, averages 22.1 °C. Months that stay below 18 °C even by day on average: October (16.4 °C), November (12.6 °C) and December (10.6 °C). Nights average below 18 °C in every month of the season, from 5.9 °C to 14.1 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.6	12.6	80	13	16:01
July	22.1	14.1	71	11	15:41
August	22.1	14.1	65	11	14:21
September	19.7	12.5	79	13	12:38
October	16.4	10.4	129	15	10:55
November	12.6	7.6	132	16	9:17
December	10.6	5.9	144	17	8:24

ERA5 2016–2025, Open-Meteo

Cucumber in nearby cities

Around Quimper, Nantes is 18 days earlier and Plymouth 32 days later.

City	Distance	Date	Difference
Brest (France)	52 km	20 June – 28 September	5 days later
Rennes	180 km	1 June – 13 September	14 days earlier
Nantes	210 km	28 May – 14 September	18 days earlier
Plymouth	264 km	17 July – 16 September	32 days later
Angers	272 km	28 May – 12 September	18 days earlier
La Rochelle	303 km	28 May – 27 September	18 days earlier

Where to buy cucumber plants and seeds near Quimper

Buy plants ready to set out from 15 June to 24 September (from 25 May to 24 September for an unheated greenhouse); seed for raising your own is sown from 27 April to 27 August. Within 15 km of Quimper OpenStreetMap lists 7 garden centres, 4 farm-supply shops, 1 plant nursery, 7 markets and 12 farm shops (collected 27 October 2026).

La Grande Pépinière — garden centre
Mon–Fri 09:30–12:30, 14:00–19:00; Sat 09:30–19:00; Sun 10:00–12:30, 14:00–18:30 · 2 km · lagrandepepiniere.fr
Le Sapin Glazik — garden centre
Chemin de Kerlay, 29510 · 11 km
Gamm Vert — garden centre
Mon–Fri 09:00–12:00, 14:00–19:00; Sat 09:00–12:30, 14:00–19:00 · 13 km
Legumaj Kergwenn — farm supply
Hent Kergoad, 29700 Plomelin · Fri 17:00–20:00 · 9 km

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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